Emsian
410.62 ± 1.95 – 393.47 ± 0.99Ma PreꞒ Ꞓ O S D C P T J K Pg N
Paleogeography of the Emsian, 400 Ma
Chronology
−420 — – −415 — – −410 — – −405 — – −400 — – −395 — – −390 — – −385 — – −380 — – −375 — – −370 — – −365 — – −360 — – Paleozoic S Devonian C M Přídolí Early Mid Late EM Lochkovian Pragian Emsian Eifelian Givetian Frasnian Famennian Tournai.           ← Hangenberg event, Famennian glaciation ← Kellwasser event (Late Devonian extinction)[1] ← Widespread[2] shrubs & trees ← Hunsrück fauna ← Rhynie chert[3] Subdivision of the Devonian according to theICS, as of 2023.[4] Vertical axis scale:Millions of years ago
Etymology
Name formality	Formal
Name ratified	1985
Usage information
Celestial body	Earth
Regional usage	Global (ICS)
Time scale(s) used	ICS Time Scale
Definition
Chronological unit	Age
Stratigraphic unit	Stage
Time span formality	Formal
Lower boundary definition	FAD of the conodontPolygnathus kitabicus
Lower boundary GSSP	Zinzil'ban Gorge,Uzbekistan 39°12′00″N67°18′20″E / 39.2000°N 67.3056°E /39.2000; 67.3056
Lower GSSP ratified	1995[5]
Upper boundary definition	FAD of theconodontPolygnathus costatus partitus
Upper boundary GSSP	Wetteldorf Richtschnitt section,Wetteldorf,Eifel,Germany 50°08′59″N6°28′18″E / 50.1496°N 6.4716°E /50.1496; 6.4716
Upper GSSP ratified	1985[6]

TheEmsian is one of threefaunal stages in theEarly Devonian Epoch. It lasted from 410.62 ±1.95 million years ago to 393.47 ±0.99 million years ago.^[7] It was preceded by thePragian Stage and followed by theEifelian Stage. It is named after theEms river in Germany.^[8] The GSSP is located in theZinzil'ban Gorge in theKitab State Geological Reserve ofUzbekistan, 35 centimetres (14 in) above the contact with theMadmon Formation.

In North America the Emsian Stage is represented bySawkill orSawkillian time.

During this period, earliest knownagoniatitidammonoid fossils began appearing within this stage after first appearing in previous stage and began to evolutionarily radiate within this stage, in which a new ammonoid orderGoniatitida rises in the end of Zlichovian stage (Siberian representation; corresponds to early Eifelian and after the end of Early Devonian, before 391.9mya).^[9][10] Later agoniatitid ammonoids would die out in theTaghanic event in the upper middleGivetian. Goniatite ammonoids would give rise to further ammonoid orders, thus starting ammonoid dominance of marine fossils in further periods until their end at theCretaceous-Paleogene mass extinction event.

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